Bus Route X leaves the station every 12 minutes.
Bus Route Y leaves the station every 18 minutes.
At 09:00, both buses leave the station at the same time.
Work out how many minutes will pass before both buses leave the station at the same time again.
59 exam-style questions on Edexcel GCSE Maths Prime Factors, HCF and LCM. Each one has a worked solution and a mark scheme showing where the marks go.